Hopefully to reflect heat and reduce carbon build up, these valves have been polished with emory cloth, 220 grit, all the way down to 1500 grit sand paper.
The Exhausts are stainless steel, but the Intakes are not... and I can not figure out why this may be the case.
Can any of you guys give a reason, or thought as to what the I in the center of the valve is indiciative of?